Jeffrey Dean Morgan
Television

Year
Title
Role
Notes
1995
Extreme
Jack Hawkins
2 episodes
1995
JAG
Weapons Officer
Episode: "Shadow"
1996
Sliders
Sid
Episode: "El Sid"
1996
In the Blink of an Eye
Jessie Tafero
Television film
1996–1997
The Burning Zone
Dr. Edward Marcase
Main cast
2000
Walker, Texas Ranger
Jake Horbart
Episode: "Child of Hope"
2001
ER
Firefighter Larkin
Episode: "The Crossing"
2002
The Practice
Daniel Glenn
Episode: The Test"
2002
JAG
CIA Technician Wally
2 episodes
2002
Angel
Sam Ryan
Episode: "Provider"
2002
The Division
Father William Natali
Episode: "Forgive Me, Father"
2003
CSI: Crime Scene Investigation
Undercover Agent #1
Episode: "All for Our Country"
2003
Star Trek: Enterprise
Xindi-Reptilian
Episode: "Carpenter Street"
2004
The Handler
Mike
2 episodes
2004
Tru Calling
Geoffrey Pine
Episode: "Two Pair"
2004
Monk
Steven Leight
Episode: "Mr. Monk Takes Manhattan"
2005
The O.C.
Joe Zukowski
Episode: "The Accomplice"
2005
Weeds
Judah Botwin
2 episodes
2005–2007; 2019
Supernatural
John Winchester/Azazel
Recurring; 13 episodes
2006
Jam
Dale
Television film
2006–2009
Grey's Anatomy
Denny Duquette
Recurring (seasons 2–3, 5); 23 episodes
2012–2013
Magic City
Ike Evans
Main role
2014
Shameless
Charlie Peters
Episode: "Lazarus"
2015
The Secret Life of Marilyn Monroe
Joe DiMaggio
2 episodes
2015
Texas Rising
"Deaf" Smith
Television miniseries
2015
Extant
JD Richter
Main role
2015–2016
The Good Wife
Jason Crouse
Main role (season 7)
2016–present
The Walking Dead
Negan
31 episodes Special guest star (season 6) Main cast (season 7–present) Won (2016) – Saturn Award for Best Guest Performance in a Television Series
2017
Robot Chicken
Negan
Voice; Episode: "The Robot Chicken Walking Dead Special: Look Who's Walking"
2017–2019
Ride with Norman Reedus
Himself
2 episodes

Question: Which television series did Morgan simultaneously appear in 2005 and 2006?
Answer: In 2005 and 2006, Morgan simultaneously appeared in three television series: in the series Supernatural as John Winchester, in a recurring role in Grey's Anatomy as Denny Duquette, and as Judah Botwin in two episodes of the series Weeds.